/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Party/PartyMember.h
typedef TMulticastDelegate_TwoParams< void, [JoinMethodArgType](API\Plugins\Party\Party\FPartyMemberRepData\JoinMethodArgType), [JoinMethodArgType](API\Plugins\Party\Party\FPartyMemberRepData\JoinMethodArgType) > FOnJoinMethodChangedDif